Rotary pump



H. J. EDWARDS.

ROTARY PUMP., APPLICATION FILED JAN.II,1919.

1,421,766, Patented July 41, 19220.

' EETSSHEET I.

INVENTOR. Henry a dwarda A T TORNEY H. J. EDWARDS.

ROTARY PUMP.

APPLlCATlON FILED JAN. H, 1919.

Patented July 4, 19226 LQQ 11,766.

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ROTARY PUMP.

Specification of Letters Patent. I

Patented July 1, 1222.

Application filed January 11, 1919. Serial No. 270,679.

his invention relates to improvements in rotary pumps, and more particularly pumps of this character provided with radially sliding pistons, the edges of which are adapted to co-operate with an eccentric surface for the purpose of pumping a liquid.

One object of my invention is to provide a device of this character wherein the piston blades-will be constantly urged in a radial direction towards the wall of the eccentric casing, thus compensating for any wear upon the outer edges of the piston blades.

A further object of this invention is to provide a device of the character described wherein a plurality of blades arranged in pairs may be employed. y A further object of this invention is to provide a device of the character described, having simple, eflicient and positively acting means for urging the piston blades out-- wardly into contact with the eccentric wall of the casing.

A further object of this invention is to provide a device of the character described which is of simple construction, eiiicient in operation, and the parts of which are readily accessible.

Further objects of this invention relate to economies of manufacture, and details of construction as will hereinafter appear from the detailed description to follow.

The objects of the invention are accomplished in one instance by the devices and means described in the following specifications, but it is evident that the same may be varied widelywithout departing from the scope of the invention, as pointed out in the appended claims.

A structure constituting one embodiment of the invention, which may be the preferred, is illustrated in the accompanying casing with the cover removed, to better show the position of the operating parts.

Figure III is a horizontal-sectional view taken along the line TH-IH of Figure H.

Figure IV is a vertical-sectional view of the pump casing, showing the relative positlon of the operating parts, and taken along the lines IV-lV of Figure 111.

Figure V is' a perspective view of the rotating drum and the drum axle. Figure V1 is a detaiLperspective view of the piston blades and the springs for connecting the same, together with the manner in which they are arranged within the rotating drum.

n the drawings, similar reference charactersrefer to corresponding parts throughout the several views.

10 represents an automobile engine of the usual construction provided with a timing gear housing cover 11 adapted to house the pump for feeding oil from the oil reservoir to the various bearing surfaces of the oper-' ating parts of the engine.

The timing gear housing cover ll'is prefpassage 13 -and an outlet passage 14 formed in the casing, both of said passages communicating with the central openlng 12. Threads are cut in the outer portions of the passages 13 and 14 as at 15 and 16 respectively to provide means for threading pipe connections to the passages at these polnts. The timing gear housing cover is provided with a plurality of openings 17', along its edge, for the purpose of providing means for bolting the same to the crank casing.

An inner cover plate 17 and an outer cover plate 18 are provided for enclosing the circular recess formed by the opening 12 in the timing gear housin cover. The inner and outer cover plates 1 and 18 are prefer-' ably provided with openings along their circumferential edges adapted to register with openings 19 formed in the cover casting thereby providing means for securing these parts together by bolts or the like 20. A; pipe 21 and pipe connection 22 is emplo ed for the purpose of connecting the threa ed portion 15 of the inlet passage with the oil reservoir, and in a similar manner the threaded portion 16 of the outlet passage'is connected by a pipe connection 23 with a distributing pipe 24:, which is adapted to communicate with the various bearings to. be lubricated and convey oil thereto, as it is furnished "by the pump.- It will "therefore be seen that the inlet passage 13 is adapted to be placed in communication with the oil reservoir through the pipe 21 and the outlet passage 14 is constructed so as to be placed in communication through the distributing pipe 24 with the various bearing surfaces which are to be supplied with lubrication. Both the inlet and the outlet passages communicate with the recess enclosed in the timing cover housing by the plates 17 and 18 positioned on the'rear and front walls of the casting, and extending over the opening 12 formed'therein.

An opening 25 is provided in the inner cover 17, substantially centrally thereof, for the reception of a bearing 26 adapted to carry a rotatable shaft 27 and provided at one end with a roove 28 for providing means for rotatabdy securing the shaft 27 to the cam shaft (not shown) of the engine. The shaft 27 is provided with a head 29 preferably formed integral therewith, and a drum 30 preferably formed integral with the head portion of the shaft. A plurality of diametrically extending slots 31, preferablyl two in number, are cut in the drum in sue a manner as to divide the drum into a plurality of segmental sections, and provide passages within the drum for the reception of the piston blades. An eccentric sleeve 32 is adapted to be positioned within the opening 12 formed in the casing, and secured in place therein by a key 32. This casing is provided with a pairof diametrically opposed openings 33 adapted to communicate with the inlet passage 13 and the outlet passage 1 1 respectively. The shaft 27 is mounted in the bushing 26 in such a manner that the exterior circumferential surface of the drum carried thereby will be concentric with the interior circumferential surface of the wall of the opening 12 formed in the casting. By reason of the eccentric formation of the sleeve 32, the exterior circumferential surface of the drum will be eccentric to the,

interior circumferential surface of the sleeve member. A plurality of piston blades 34 are adapted to be slidably mounted in the slots.

31 formed in the rotating drum 30. These piston blades are preferably arranged in pairs; the blades of each pair being connected by a flat spring 35, the ends of which are seated in notches 36 cut in the inner surfaces of the piston blades.

In the operation of this device, the shaft 27 is operatively connected by the slot 28 with the cam shaft of the engine (not shown) in such a manner as to constantly rotate therewith. The inlet passage in the casing being in communication with the oil reservoir through the connecting pipe 21 permits oil being readily drawn from the oil reservoir by the pump through the passage 13 and the corresponding opening 33 formed in the eccentric sleeve. When the shaft 27 and the drum 30 carried thereby is rotated in a counter-clockwisedirection, as seen in- (Figures II and IV), the spring pressed piston blades 34 being constantly pressed outward by the spring 35, so that-their outer edges will contact with the inner circumferential surface of the eccentric sleeve, the oil will be drawn by the rotation of the pump through the eccentric passage formed in the sleeve and be discharged through the 80 opposite opening 33 into the outlet passage 14, from which it passes through the pipe (24 for distribution to the various bearing surfaces to be lubricated. The shaft 27 being mounted in such a manner that the exterior circumferential surface of the drum is concentric with the inner circumferential surface of the opening 12 formed in the casting, and thesleeve 32 being of eccentric form, an eccentric opened portion is provided between the inner circumferential surface of the sleeveand the outer circumferential surface of the drum thus providing a passage for the oil as it'is forced along by the piston blades. It will be apparent, that by mounting the piston blades in the manner shown and described, both of the blades comprising each pair is urged outwardly in a radial direction with respect to the drum, and thus their outer edges are constantly maintained in contact with the inner circumferential surface of the sleeve to compensate for any wear upon the outer edges of the piston blades. Moreover, this form of mounting permits a. slight rocking movement of each of the piston blades, thus permitting the outer edges of the same to adapt them selves to the inner circumferential surface of the eccentric sleeve in such a manner as to maintain themselves in perfect contact 110 therewith at all times.

It will be obvious from the foregoing description that this invention provides a. simple, efficient and positively acting means for feeding lubricating oil to the various bear- 115 ing surfaces of an engine.

While I have shown. and described in considerable detail a specific embodiment of my invention, it is to be understood that this showing and description is illustrative only, 120 and for the purpose of rendering my invention more clear, and that I do not regard the invention as limited to the details of construction illustrated or described, nor any of them, except in so far as I have included 12 such limitations within the terms of the fol-' lowing claims, in which it is my intention to clalm all novelty inherent in my invention broadly as well as specifically.

Having thus described my invention, what 130 I claim as new and desire to ters Patent is:

1. In a device of the 'class described, an eccentric chamber, a rotating drum positioned therein, and a plurality of pistons arranged in pairs and slidably positioned in said drum, the pistons of each pair being connected to each other by a leaf spring.

2. Ina device of the class described, a pump cylinder, an eccentric sleeve positioned therein, a rotating drum located within the sleeve, and a plurality of pistons arranged in pairs and slidably mounted in said drum, the pistons of each pair being connected to each other by a leaf spring.

3. In a rotary pump structure, a cylinder, a drum-mounted in the cylinder and provided with diametrically extending slots, a pair of piston blades mounted in each slot, and a curved leaf spring positioned between each pair of blades for constantly urging them outwardly into engagement with the interior of the casing.

4. In a rotary pump structure, a pump cylinder, a rotatable drum located Within the cylinder, a plurality of piston blades arranged in pairs and slidably mounted in said drum, and oppositely arranged curved leaf s rings connecting the blades of each pair, the curved portions of the springs permitsecure by Letting the springs to be so arranged between the blades as to bear thereon adjacent the longitudinal center of each blade.

In a rotary pump structure, a pump cylinder, a rotatable drum mounted within the cylinder, a plurality of piston blades arranged in pairs and slidably mounted in said drum, each of said blades being provided with a notch formed in the inner edge thereof, and oppositely arranged curved leaf springs positioned between opposite blades and having their ends fitting within the said notches.

6. In a rotary pump structure, a pump cylinder, a rotatable drum, a plurality of radially slidable piston blades arranged in pairs and mounted in said drum, and bent leaf springs arranged between the blades of each pair and. having their bent portions extending in opposite directions.

7. In a rotary pump structure, a pump cylinder, a rotatable drum, a plurality of two part pistons slidably mounted 1n sald drum, and curved leaf springs connecting the parts of each piston, the curved portions of the springs being reversely positionedrelative to each other.

In testimony whereof, I afiix my signature.

HENRY J. EDWARDS. 

